"One robber put a gun to the head of (the female clerk), put her in a walk-in cooler and told her not to do anything stupid or her son would be killed," said Sgt. Greg Johnston. The robbers thought the other clerk was related to the woman, Johnston said.
The male clerk was told to get down on the floor while money was taken from two cash registers, a cash box and a bank bag.
The male clerk was forced into the cooler and told not to do anything stupid or he would be killed, police reports said.
Police said they later learned the ski masks and the BB handguns had been purchased at the Kmart in Hagerstown.
After being arrested in a stolen car in Baltimore County, Md., Hacker was interviewed by police on Jan. 20, according to police.
Police say four youths rode around in a stolen vehicle on Jan. 5, first robbing a woman in Howard County, Md., and then another in Harford County, Md.
Netting $290 in those two robberies, they spent that money on beer, whiskey and marijuana, police said. Then the four youths traveled to Hagerstown while discussing committing a robbery, police said.
Police said the stolen vehicle the four youths were in was later abandoned in Frederick County, Md., and another one was stolen there and later recovered in Harford County.
Three youths, who were all named in Hacker's charging document, are either at large or haven't been charged with the robbery, police said.